"With everything in place I ran the main set of real world tests over and over and averaged the results. I ran the boot-time test over fifty times and again averaged the results. Now I'm prepared to run the same tests after installing each security suite and compare the results. It's going to be a little rough to start - I won't know exactly how to interpret the results until I have a few data points from different suites. And I plan to add a few more tests specifically targeting CPU and resource consumption. Going forward I'll be able to say "Suite X slows browsing by half" or "Suite Y adds two minutes to boot time". That will be fantastic information for those trying to make a choice."

http://www.appscout.com/2008/08/secu...ance_tes_1.php